Speaking to EW, Guggenheim mentioned an upcoming episode of DC’s Legends of Tomorrow will see the gang visit late ’60s Los Angeles, right when a young Lucas was getting his start in film:

Because of circumstances, the time aberration in episode 209 is George Lucas quits film school. As a result, he never makes Star Wars or Raiders of the Lost Ark. As a result, Ray, who became an engineer because of Star Wars, and Nate, who became a historian because of Raiders, slowly start to lose their brilliance, because those things that inspired them to become who they are didn’t exist.”